1. What is BMI?

BMI (Body Mass Index) is a measure that uses your height and weight to determine if your weight is healthy. The NHS uses BMI as a screening tool to identify potential weight problems in adults.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Your weight in kilograms (kg)
• \( height \) — Your height in meters (m)

Explanation: BMI compares your weight to your height to estimate body fatness and health risks.

3. Importance of BMI Calculation

Details: BMI helps identify potential weight-related health problems. While not a direct measure of body fat, it correlates with more direct measures and can indicate risk for diseases like diabetes and heart disease.

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. For most accurate results, measure weight in the morning before eating and after using the toilet.

5. Frequently Asked Questions (FAQ)

Q1: What are the NHS BMI categories?
A: Underweight (below 18.5), Healthy weight (18.5-24.9), Overweight (25-29.9), Obese (30 and above).

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older people who have lost muscle mass.

Q3: Should children use this calculator?
A: No, children need age and sex-specific BMI calculations as their body composition changes with growth.

Q4: What if I'm pregnant?
A: BMI calculations during pregnancy aren't meaningful. Consult your midwife for appropriate weight guidance.

Q5: What should I do if my BMI is high?
A: Consult your GP who may consider other factors like waist circumference and can provide personalized advice.